Confirming on Firefox 41.
Open "Blocked By" dialog, paste T34482 in the text field, click "Select" once it is shown, click "Save 'Blocked By' Tasks" at the bottom.
Browser sends a HTTP 200 which turns into a 503:
Request: POST http://phabricator.wikimedia.org/search/attach/PHID-TASK-p5nqnkahr2g5sm6kpzi4/TASK/blocks/, from 10.64.32.134 via cp1057 cp1057 ([10.64.32.134]:80), Varnish XID 975093205
Forwarded for: 12.345.67.890, 10.64.32.134
Error: 503, Service Unavailable at Wed, 21 Oct 2015 08:39:27 GMT
Confirming that this is resolved.
The testcase provided in this task now triggers a dialog:
You can not create that relationship because it would create a circular dependency:
T38591: Use the Translate extension in CentralNotice (tracking) → T34482: CentralNotice needs a better way to manage shared messages → T38591: Use the Translate extension in CentralNotice (tracking)